DTC B1321-87: Lost Communication with EMV Missing Message [07/2020 - 05/2023]: Procedure

1. Check if navigation system DTCs are output.

   Refer to DTC CHECK / CLEAR [07/2020 - 10/2022] , or refer to DTC CHECK / CLEAR [10/2022 - 05/2023]

   Body Electrical > Navigation System > Trouble Codes 

   Result

   Result	Proceed to
   Navigation system DTCs are not output.	A
   Navigation system DTCs are output.	B

Result: 

B 

GO TO NAVIGATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - 05/2023] 

Result: 

A 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the meter mirror sub-assembly connector.
2. Measure the resistance and voltage according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P80-4 (ES) - Body ground	Always	Below 1 Ω

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   P80-2 (B) - Body ground	Always	11 to 14 V
   P80-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the meter mirror sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P80-14 (TX+) - P80-15 (TX-)	Cable disconnected from negative (-) battery terminal	54 Ω to 69 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Check if meter / gauge system DTCs are output.

   Refer to DTC CHECK / CLEAR [07/2020 - ]

   Body Electrical > Combination Meter > Trouble Codes 

   Result

   Result	Proceed to
   DTC B1321 is not output.	A
   DTC B1321 is output.	B

Result: 

A 

REPLACE METER MIRROR SUB-ASSEMBLY. Refer to  REMOVAL [07/2020 - 05/2023] 

Result: 

B 

REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2020 - 05/2023]